Anyway, as awesome as this is it seems like something is missing... I can't quite place my finger on what though.
Just a thought: perhaps all good saves would be a good idea for this class. Indie could stay alive/healthy with the best of them in any situation. Or maybe In The Face Of Death should apply to saves aswell?
Now I want to make a PrC that specializes in improving the Impromptu Crafting ability...